A 28-year-old man has been charged with leaving the scene of an accident resulting in death in the case of a body found in Lee County early Sunday.

Damian Hamann, of Morning Sun, Iowa, turned himself into the Lee County Sheriff's Office after the body of his girlfriend, 20-year-old Sadie Alvarado, was found Sunday. Hamann told police Alvarado jumped out of his car while they were arguing, according to a criminal complaint filed by the Lee County attorney.

He told police he drove home to Morning Sun — about 35 miles north — but went back to Lee County after noon to look for her, the complaint says.

Near the location, south of West Point, Iowa, where authorities said Sunday, Aug. 5, 2018, they were investigating the discovery of a body. Officials in the area declined to comment.(Photo: Aimee Breaux / Iowa City Press-Citizen)

An autopsy of Alvarado's body is scheduled for Tuesday to determine the manner and cause of death, said Iowa Division of Criminal Investigation Special Agent Rick Rahn.

Hamann turned himself in late Sunday because "he was aware that there were pending charges" against him, Rahn said. He has not yet appeared before a judge for an initial arraignment. An attorney for Hamann has not been identified.

The case is still under investigation by the Iowa Division of Criminal Investigation and the Lee County Sheriff's Office.